import { WalkerState } from "../types";
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type OnQueueEmptyCallback = (error: Error | null, output: WalkerState) => void;
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/**
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* This is a custom stateless queue to track concurrent async fs calls.
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* It increments a counter whenever a call is queued and decrements it
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* as soon as it completes. When the counter hits 0, it calls onQueueEmpty.
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*/
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export declare class Queue {
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private readonly onQueueEmpty;
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private count;
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constructor(onQueueEmpty: OnQueueEmptyCallback);
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enqueue(): void;
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dequeue(error: Error | null, output: WalkerState): void;
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}
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export {};
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